Bearing for type-writer rollers.



.T. 'B. GRUNER.

BEARING FOR T'YPE WRITER ROLLERS. APPLICATION man OCT. 14. 1915.

' Patented Mar. 28, 1916.

sans rarnnr enrich.

'rnonn BJ'ERKE cnunnn, or on nrs'rranm, nonwar, .assrenon TO unnnnwoon TYPEWRITER compan or nnw nonn, n. Y., a oonronarion or DELAWARE.

BEARING FOR TYPE-WRITER ROLLERS.

Specification of Letters Patent.

Patented Mar. 28, 191%.

Application filed Gctoher 14, 1915. Serial No. 55,751.

To all whom it may concern: I

Be it known that I, Tnonn Banana GR NER, a subject of the King of Norway, residing in 'Christiania, Norway, have invented certain new and useful Improvements in Bearings for Type-'Writer Rollers, of which the following is a specification.

This invention relates to rotaryplatens for typewriting machines, and more particularly to means toenable the platen to be quickly rammed from the machine and replaced; I

The platenis 'removab ly mounted on stub shafts or short axles journaled in the ends of the 'platenframe, and each having a. platenrotating mea'ns, such as ahand wheel; one of these shafts alsoha'ving a line-space wheel. The platen has a positive centering and-driving connection with each-axle, permitting the platen to be rotated by the hand wheels, line-space wheel, or other mechanism operating, through said axles. The inner end of each axle may be provided with a head havin g an interlocking connection-with .the adjacent platen, end. "Such connection may be intheform of a tenon or squared projection from the platen end, which fits a corresponding recess or mortise in theadjoining head, thereby positively locking the platen and axle against relative rotation.

Tof prevent any lateral displacement of the platen, and to hold it in accurate alinement with its axl'e, a centering pin may be provided, ateach head to entera corresponding ,socketor bore in the platen end. Each pin isl-c'oiivenientlyformed by the inner end of the platen jaxleprojecting into the mortise inthesaidhead to enter the opening or socket in the tenon. Y

In order to releasethe platen, one of the stub shafts'oraxles may be mounted for a ,m-gte nee The pin limited endwise releasing movement, so that the axlemay'fbe withdrawn from the platen, permit'ti gtheadjacent end of the platen tdfcarry it beyond said head.

y'then be moved out of enith. the opposite axle, and enga geinn tirely disconnected from themachine. To lock' the'ino'vable stub shaft in its operative pos tion, a latch is mounted on the platen" frame" end, to enter anannular 1 holding rer-oss in the stub shaft. The platen is preferably reversible, the platen ends being formed alike to interlock with either platen axle.

Other features and advantages will hereinafter appear.

In the accompanying drawings, which illustrate the invention as applied to an Underwood typewriting machine, Figure 1 is a front perspective view showing the platen frame and the detachable platen thereon. Fig. 2 is a part sectional front elevation of the same. Fig. 3 is a fragmentary end elevation showing the locking latch or detent withdrawn to permit removal of the platen. Fig. 1 is a fragmentary sectional elevation showing the right-hand axis withdrawn to free the platen for removal from the machine. Figs. 5 and 6 are perspective views of the preferred form of the invention, in which the tenon is formed with a cross-piece or jogs, and in which the mortise is formed with corresponding grooves.

The roller platen 5 is mounted in a platen frame comprising ends 6 and 7 united by a paper shelf 8 at the introductory side of the platen. Key-operated types 9 strike against the front face of the'platen for printing in the usual manner. The platenfiframe and platen may be mounted to shift up and down on the carriage 10 to upper and lower case positions. The platen may be rotated by hand wheels 11 mounted on stub shafts or platen axles 12 and 13, journaled respectively in the left-hand andright-hand ends of the platen frame. Line-space mechanism for rotating the platen may comprise a linespace ratchet-wheel 14 on the axle 12, said Wheel being driven by a pawl 15 pivoted on a slide bar 16, actuated by a line-space lever 17 pivoted on the carriage. The distance through which the platen is rotated by the which'holds the pawl free from the ratchet- "wheel, during the initial movement of the pawl, said ledge being adjustable by a hand lever 18, to vary the point at which the pawl is brought into driving connection with the wheel. The parts thus far described, except for the use of separate platen axles at the ends of the platen, may bethe same as are found-inthe commercial Underwood machine.i-

In accordance with the present invention,

of set screws 23.

spring.

the platen is detachably mounted on the short axles 12 and 13. For this purpose each of said axles has secured to its inner end a head-19, formed on its inner face with a recess or mortise 20, to receive a tongue or tenon 21 on the adjacent end of the platen.

The tenons 21 preferably have fiat parallel faces which closely fit in the square openings 20, thereby providing a firm connection which positively prevents any relative rotation or play between the platen and its axles. In order to prevent any lateral displacement or movement of the platen out of alinement with its axles, the inner ends of. the axles 12 and 13 project into mortises 20 and enter sockets or openings 22 in the tenons 21. The heads 19 may be fixed to the shafts in a'ny suitable manner, as for example, by means In order to permit the platen to be disconnected from its shafts. one of said shafts, preferably the one at the right-hand end of the platen frame, is arranged for a limited endwise movement in its bearings, permitting the head 19 carried thereby to be withdrawn from its platen-holding position, Fig- 2, to the Fig. 4 position, wherein the shaft 13 has been withdrawn some distance from its socket 22, permitting the platen to be moved lengthwise to the right suiiiciently to release the left-hand end of the platen from the shaft 12. The right-hand end of the platen may then be swung upwardly to clear the platen frame, and the platen bodily removed from the machine. The shaft 13 is normally held against endwise movement from operative position by means of a locking latch or detent 25, pivoted at 26, on the platen frame. and formed with a recess 27, to receive the shaft 13. The detent 25 enters an annular recess 28, which may be formed by means of the hub of the hand wheel 11. and a collar 29 fixed to the shaft and spaced a short distance from said hub. The locking detent 25 may be operated by a lever 30, having a handle 31, said lever mounted by a pivot 32 on the platen frame, and connected through a link 33 to the detent.

The locking latch 25 mav be held in either its axle-holding position (Fig. 1), or its released position (Fig. 3), by the following means: The pivot 32 of the lever 30 comprises a stem 34 extended through the platen frame end plate 7. and has mounted thereon, on the inner side of said platen, a coil spring 35. held between said plate and a stop or washer 36-on the stem 34. The washer is held in position by a nut 37, threaded on the stem 34, the arrangement permitting adjustment of the tension of the A detcnt 38 on the lever 30 is adapted to seat in recesses 39 in the end plate 7. thereby yieldingly holding the lever with the locking latch 25 in either position. The spring 35 serves to hold the detent 38 seated in either recess 39, but permits the detent to be released by-pressure on the handle 31 in a. direction to rotate the lever 30 for swinging the locking latch 25 to either position.

The shapes of the interlocking parts at both ends of the platen are preferably the same, so that the platen may be reversed or turned end for end. The opposite faces of each tenon 21 may also be parallel, so that said tenons may be introduced in their sockets or mortises with the platen in either of two rotative positions, 180 degrees apart, thus facilitating quick positioning of the platen for connection with its shaft. It will be seen that the platen may be connected to its axles in any one of four positions relative to the axles.

The left-hand platen axle 12 is held against endwise play in any convenient manner. As shown, endwise movement of the shaft in one direction is prevented by the line-space wheel abutting a hub 40 on the platen frame. The head 19 on the shaft bears against the inner face of the frame end, and prevents movement in the opposite direction. Endwise play of the platen is thus prevented as the platen has a close fit between the ends of the axles. and both axles are securely held against lengthwise movement.

In order to secure the desired rigidity of the structure'and absence of liability of the platen t0 skew or buckle at these joints while in a machine, the tenon 21 (Fig. 5) is formed on opposite sides with jogs or projections 41, which fit closely incutawavs or grooves 42 formed in the opposite sides of the mortise20 in the hub or boss 19. If desired. the nipple or inner projecting end 43 of the axle or stub shaft 12 or 13 may be omitted. Each end of the platen may be fitted with the device shown in Figs. 5 and 6. Variations nay be resorted to within the scope of the invention, and portions of the improvements may be used without others. Having thus described my invention, I claim:

1. In a typewriting machine, the combination with a platen frame. of platen axles rotatably mounted in the ends of said frame. a roller platen, means for removably attaching the platen to said axles, said means comprising interlocking devices on the inner end of each axle and the ends of the platen'to prevent relative rotation of the platen and axles, and means to lock the platen against lateral movement relatively to said axles. one of said axles being mounted for endwise movement in the platen frame. to release it from the platen and permit the platen to be released from the opposite axle.

2. In a typewriting machine. the combination with a platen frame, of a roller platen, short platen axles journaled in the platen frame, means for releasably connectmovement of the platen andaxles, one of,

said axles mounted for endwise movement in the platen frame, to release the platen.

3. In a typewriting machine, the combination with a platen .frame, of a roller platen, short platen axles journaled in the platen frame, means for releasably connect-' ing the platen to said axles; said means comprising heads carried by the platen axles, interlocking projections on the platen, said heads and projections formed to prevent relative rotation of the platen and axles and disconnectible by a relative end- Wise movement of the platen and axles, one of said axles mounted for endwise movement in the platen frame, to release the platen, and a latch mounted on the platen frame movable into and out of position to lock said endwise movable axle in platenholding position.

4. In a typewriting machine, the combination with a platen frame, of a roller platen, platen axles jo'urn-aled in the platen frame for removably supporting the platen, the platen ends being provided with sockets or recesses to receive the inner ends of the said axles, and thereby hold the platen against lateral play or movement relatively to the axles, one of said axles being mounted to shift endwise in the platen frame, to release one end of the platen from its axle, and permit the platen to be disengaged from the other platen axle, and means toprevent relative rotation of the platen and either axle when the platen is in position on said axles.

5. In a typewriting machine, the combination with a platen frame, of a roller platen, platen axles journaled in the platen frame for removably supporting the platen, the platen ends being provided with sockets or recesses to receive the inner ends of the said axles, and thereby hold the platen against lateral play or movement relatively to the axles, one of said axles being mounted to shift endwise in theplaten frame, to release one end of the platen from its axle, and permit the platen to be disengaged from the other platen axle. means to prevent relative rotation of the platen and either axle when the platen is in position on said axles, said means comprising rnortised heads on said axles, and tenons on the platen ends to seat in the mortises in said heads.

6. In a typewriting machine, the combination with a roller platen and a platen frame, of an axle journaled in an end of the platen frame, one end of the platen having a central opening to receive the'end of said axle, interlocking means on the platen and said axle respectively, to prevent relative rotation of the platen and axle, the platen and axle being arranged for relative endwise movement to release the platen from the axle, and means forming a releasable mounting for the other end of the platen, permitting the platen to be removed from the machine.

7. In'a typewriting machine, the combination with a platen frame, of a platen axle rotatively mounted in one end thereof, a roller platen having a central socket or opening to receive the inner end of said axle, interlocking means on the platen and axle to prevent relative rotation of the platen and said axle, the platen and axle being arranged for relative endwise movement to release the platen from the axle, a second axle in the opposite end of the platen, and means to relea'sably connect said second axle to the platen to rotate therewith.

8. In a typewriting machine, the combination with a roller platen and a supporting frame therefor, of an axle journaled in said frame, the platen having a socket or opening in one end thereof to receive the end of said axle, interlocking means on the platen and axle respectively, to prevent relative rotation of the platen and axle, the

latter being mounted for endwise movement to release the platen, andmeans to hold the axle in platen-supporting position. I

9. In a typewriting machine, the combination with a roller platen and a supporting frame therefor, of an axle journaled in said frame, the platen having a socket or openingin one end thereof to receive the end of said axle, interlocking means on the platen and axle respectively, to prevent relative rotation of the platen and axle, the latter being mounted for endwise movement to release the platen, means to hold the axle in platen-supporting position, a second axle journaled in said frame, and means forming an interlocking connection between said second axle and the platen for holding the platen against lateral movement relatively to said second axle, and also preventing relative rotation of the platen and said second axle, said interlocking connection being controlled by said latch, whereby the platen. when released by the"endwise movement of the first-mentioned axle, is free for removal from the machine.

10. In a typewriting machine, the combination of a platen frame, alined platen axles journale d in the ends of said frame, a roller platen provided with central openings or sockets in the ends thereof, to receive the inner ends of said axles, and interlocking means to prevent relative rotation of the platen and axles, one of said axles mounted for endwise movement, to withdraw from its socket in the platen and free the platen for disconnection from the machine.

11. In a typewriting machine, the combi nation of a platen frame, alined platen axles journaled in the ends of said frame, a roller platen provided with central openings or sockets in the ends thereof, to receive the inner ends of said axles, interlocking means to prevent relative rotation of the platen and axles, one of said axles mounted for endwise movement, to withdraw from its socket in the platen and free the platen for disconnection from the machine, said interlocking means comprising" mortised heads attached to the axles, with the ends of the axles projecting into the mortises, and tenons on the platen ends to seat in said mortises, said sockets being formed in said tenons.

12. In a typewriting machine, the combination of a platen frame, alined platen axles journaled in the ends of said frame, a roller platen provided with central openillg's or sockets in the ends thereof, to receive the inner ends of said axles. and interlocking means to prevent relative rotation of the platen and axles, one of said axles mounted for endwise movement, to withdraw from its socket in the platen and free the platen for disconnection from the machine, the interlocking means at both ends of the platen being substantially identical inform, and permitting the platen to be reversed.

13. The combination, with a platen frame, and a roller platen; of platen axles rotatably mounted in the ends of said frame and connected with said platen to support the same, one of said axles being mounted for endwise movement in said frame to detach it from the platen and permit the latter to manner be detached from the other axle, said platen having one end interlocked with the adjacent axle to prevent relative rotation thereof.

14. The combination, with a platen frame, and a roller platen; of platen axles rotatably mounted in the ends of said frame and connected with said platen to support the same, one of said axles being mounted for endwise movement in said frame to detach t from the platen and permit the latter to be detached from the other axle; and means to prevent relative rotation of said platen and said axles.

15. The combination, with a platen frame. and a roller platen; of platen axles rotatably mounted in the ends of said frame and connected with said platen to support the same, one of said axles being mounted for endwise movement in said frame to detach it from the platen and permit the latter to be detached from the other axle; means to prevent lateral movement of said platen relative to said axles; and means to prevent relative rotation of said platen and said axles.

16. The combination, with a platen frame. and a roller platen; of platen axles rotatably mounted in the ends of said frame and connected with said platen to support the same, one of said axles being mounted for endwise movement in said frame to detach it from the platen and, permit thelatter to be detached from the other axle, said platen having one end interlocked with the adjacent axle to prevent relative rotation thereof; and means to lock said movable axle in platen-holding position.

THORE BJERKE GRUNER.

/Vitnesses 'W. O. l VEs'rPI-IAL, ARTHUR A. JOHNSON. 

